CVE-2016-20026

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-16. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

ZKTeco ZKBioSecurity 3.0 contains hardcoded credentials in the bundled Apache Tomcat server that allow unauthenticated attackers to access the manager application. Attackers can authenticate with hardcoded credentials stored in tomcat-users.xml to upload malicious WAR archives containing JSP applications and execute arbitrary code with SYSTEM privileges.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
51.8%
KEV
Not listed

Published

March 16, 2026

Last Modified

June 8, 2026

Advisory Details (6)

Auto-updated Jun 20, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

Zero Science Lab — Information Security Research & Development Laboratory

https://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5362.php
generic

ZKTeco ZKBioSecurity 3.0 Hardcoded Credentials Remote Code Execution | Advisories | VulnCheck

https://www.vulncheck.com/advisories/zkteco-zkbiosecurity-hardcoded-credentials-remote-code-execution
generic🟡 PoC Available

ZKTeco ZKBioSecurity 3.0 - Hard-Coded Credentials SYSTEM Remote Code Execution - JSP webapps Exploit

https://www.exploit-db.com/exploits/40324/
generic

Packet Storm

https://packetstormsecurity.com/files/138567
generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/116484
generic

ZKTeco ZKBioSecurity 3.0 Hardcoded Credentials Remote SYSTEM Code Execution - CXSecurity.com

https://cxsecurity.com/issue/WLB-2016080266

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 131 total refreshes for this CVE.

  1. 2026-07-15 16:54 UTCEPSS rescore
  2. 2026-07-15 16:54 UTCEPSS rescore
  3. 2026-07-15 01:56 UTCEPSS rescore
  4. 2026-07-15 01:56 UTCEPSS rescore
  5. 2026-07-13 22:26 UTCEPSS rescore
  6. 2026-07-13 06:09 UTCEPSS rescore
  7. 2026-07-12 05:43 UTCEPSS rescore
  8. 2026-07-12 05:43 UTCEPSS rescore
  9. 2026-07-11 08:23 UTCEPSS rescore
  10. 2026-07-09 19:05 UTCEPSS rescore
  11. 2026-07-08 15:10 UTCEPSS rescore
  12. 2026-07-07 13:42 UTCEPSS rescore
  13. 2026-07-06 16:24 UTCEPSS rescore
  14. 2026-07-06 16:24 UTCEPSS rescore
  15. 2026-07-06 02:20 UTCEPSS rescore
  16. 2026-07-06 02:20 UTCEPSS rescore
  17. 2026-07-05 02:27 UTCEPSS rescore
  18. 2026-07-04 06:28 UTCEPSS rescore
  19. 2026-07-01 15:02 UTCEPSS rescore
  20. 2026-06-30 23:19 UTCEPSS rescore
  21. 2026-06-29 14:03 UTCEPSS rescore
  22. 2026-06-28 14:04 UTCEPSS rescore
  23. 2026-06-28 04:53 UTCEPSS rescore
  24. 2026-06-27 03:05 UTCEPSS rescore
  25. 2026-06-27 03:05 UTCEPSS rescore
Show 75 more
  1. 2026-06-25 13:47 UTCEPSS rescore
  2. 2026-06-25 13:47 UTCEPSS rescore
  3. 2026-06-24 14:02 UTCEPSS rescore
  4. 2026-06-24 14:02 UTCEPSS rescore
  5. 2026-06-23 21:30 UTCEPSS rescore
  6. 2026-06-22 14:23 UTCEPSS rescore
  7. 2026-06-21 14:54 UTCEPSS rescore
  8. 2026-06-21 14:54 UTCEPSS rescore
  9. 2026-06-21 01:57 UTCEPSS rescore
  10. 2026-06-21 01:57 UTCEPSS rescore
  11. 2026-06-19 19:23 UTCEPSS rescore
  12. 2026-06-19 19:23 UTCEPSS rescore
  13. 2026-06-18 17:50 UTCEPSS rescore
  14. 2026-06-17 17:50 UTCEPSS rescore
  15. 2026-06-17 17:50 UTCEPSS rescore
  16. 2026-06-16 17:50 UTCEPSS rescore
  17. 2026-06-16 17:50 UTCEPSS rescore
  18. 2026-06-15 17:45 UTCEPSS rescore
  19. 2026-06-14 23:14 UTCEPSS rescore
  20. 2026-06-13 22:57 UTCEPSS rescore
  21. 2026-06-13 22:57 UTCEPSS rescore
  22. 2026-06-12 23:09 UTCEPSS rescore
  23. 2026-06-12 23:09 UTCEPSS rescore
  24. 2026-06-12 03:42 UTCEG score recompute
  25. 2026-06-12 03:42 UTCGHSA enrichment
  26. 2026-06-12 00:01 UTCEG score recompute
  27. 2026-06-12 00:01 UTCGHSA enrichment
  28. 2026-06-11 13:57 UTCEPSS rescore
  29. 2026-06-10 23:15 UTCEG score recompute
  30. 2026-06-10 23:15 UTCGHSA enrichment
  31. 2026-06-10 22:15 UTCEPSS rescore
  32. 2026-06-10 19:34 UTCEG score recompute
  33. 2026-06-10 19:34 UTCGHSA enrichment
  34. 2026-06-10 15:54 UTCEG score recompute
  35. 2026-06-10 15:54 UTCGHSA enrichment
  36. 2026-06-10 13:18 UTCEPSS rescore
  37. 2026-06-10 09:37 UTCEG score recompute
  38. 2026-06-10 09:37 UTCGHSA enrichment
  39. 2026-06-10 05:56 UTCEG score recompute
  40. 2026-06-10 05:56 UTCGHSA enrichment
  41. 2026-06-10 01:53 UTCEG score recompute
  42. 2026-06-10 01:53 UTCGHSA enrichment
  43. 2026-06-09 16:45 UTCEG score recompute
  44. 2026-06-09 16:45 UTCGHSA enrichment
  45. 2026-06-08 14:14 UTCEPSS rescore
  46. 2026-06-08 09:17 UTCEG score recompute
  47. 2026-06-08 09:17 UTCGHSA enrichment
  48. 2026-06-08 05:27 UTCEG score recompute
  49. 2026-06-08 05:27 UTCGHSA enrichment
  50. 2026-06-08 01:46 UTCEG score recompute
  51. 2026-06-08 01:46 UTCGHSA enrichment
  52. 2026-06-07 22:06 UTCEG score recompute
  53. 2026-06-07 22:06 UTCGHSA enrichment
  54. 2026-06-07 18:22 UTCEG score recompute
  55. 2026-06-07 18:22 UTCGHSA enrichment
  56. 2026-06-07 15:22 UTCEPSS rescore
  57. 2026-06-07 15:22 UTCEPSS rescore
  58. 2026-06-07 14:40 UTCEG score recompute
  59. 2026-06-07 14:40 UTCGHSA enrichment
  60. 2026-06-06 13:45 UTCEPSS rescore
  61. 2026-06-05 22:44 UTCEPSS rescore
  62. 2026-06-05 06:08 UTCEPSS rescore
  63. 2026-06-05 06:08 UTCEPSS rescore
  64. 2026-06-04 13:10 UTCEPSS rescore
  65. 2026-06-04 13:10 UTCEPSS rescore
  66. 2026-06-02 20:10 UTCEPSS rescore
  67. 2026-06-01 13:49 UTCEPSS rescore
  68. 2026-06-01 13:49 UTCEPSS rescore
  69. 2026-05-31 22:28 UTCEPSS rescore
  70. 2026-05-31 22:28 UTCEPSS rescore
  71. 2026-05-31 00:14 UTCEPSS rescore
  72. 2026-05-29 13:41 UTCEPSS rescore
  73. 2026-05-28 13:42 UTCEPSS rescore
  74. 2026-05-28 13:42 UTCEPSS rescore
  75. 2026-05-27 13:38 UTCEPSS rescore

Frequently asked(5)

What is CVE-2016-20026?
CVE-2016-20026 is a critical vulnerability published on March 16, 2026. ZKTeco ZKBioSecurity 3.0 contains hardcoded credentials in the bundled Apache Tomcat server that allow unauthenticated attackers to access the manager application. Attackers can authenticate with hardcoded credentials stored in tomcat-users.xml to upload malicious WAR archives containing JSP…
When was CVE-2016-20026 disclosed?
CVE-2016-20026 was first published in the National Vulnerability Database on March 16, 2026, with the most recent update on June 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-20026 actively exploited?
CVE-2016-20026 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 51.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-20026?
CVE-2016-20026 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-20026?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-20026, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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